/Engine/Plugins/Experimental/Animation/PoseSearch/Source/Runtime/Public/PoseSearch/PoseSearchFeatureChannel.h
This enumeration controls the channel sampling time: for example if a channel specifies a bone and an origin bone (used to generate the reference system of the features associated to the bone), bone and origin bone will be evaluated at potentially different times:
enum EPermutationTimeType { UseSampleTime, UsePermutationTime, UseSampleToPermutationTime, }